Roller-tooth gear.



PATENTED DEC. 17,. 1907.

G.A.JANSON.

ROLLER TOOTH GEAR.

APPLICATION IILBDAPR. 11. 1907- size.

CARL AUGUST JANSON, OF CHICAGO, ILLINOIS ROLLER-TOOTH GEAR.

Specification of Letters Patent.

Patented Dec. 17, 1907.

Application filed April 11, 1907- Serial No. 367,614.

To all whom it may concern:

Be it known that I, CARL AUeUsT JANsoN, a subject of the King of Sweden,and a resident of Chicago, county of Cook, and State of Illinois, haveinvented certain new and useful Improvements in Roller-Tooth Gears, ofwhich the following is a specification.

The main objects of this invention are to provide an improvedroller-tooth for gearwheels and racks which mesh with spiral orworm-gears; and to provide an improved form of journal-bearings and endthrustbearings for such teeth, reducing the friction to a minimum andadmitting of maximum tooth strength. These objects are attained by theconstruction shown in the accompanying drawings, in which:

Figure 1 is a side elevation, partly broken away, of a wheel constructedaccording to this invention. Fig. 2 is a section of the same on line 22of Fig. 1. Fig. 3 is a detail of one of the disks of the roller cages.Fig. 4 is a sectional view of the cage.

In the construction shown, the body of the wheel comprises two flangedmembers 3 and 4, laid face to face, and an annular rim or tooth-ring 5,embracing a part of the periphery of each member 3, 4. One of themembers, 3, is provided with the hub 6, the other member 4 being fittedover the hub] Desirably said members are provided with flanges 7, thatpartly inclose the sides of the toothring. The members 3 and 4 aresecured together by screws 8. Through the flanges 7 pass screws 9 thatenter the tooth-ring 5 and prevent rotation thereof relative to thewheel members 3, 4.

The tooth-ring 5 is provided with an annular series of radially disposedtooth-sockets 10, which are tapered from without inwardly, and at theirinner ends are abruptly reduced in diameter so as almost to touch thetoothshank 11 where the latter passes therethrough. The inner surface ofthe ring 5 around each socket is milled flat, to provide a suitableannular bearing surface for the retaining-balls 12. 7

Just radially inward from the inner end of thetooth-socket 10, the wheelmembers 3, 4 are provided with a recess which comprises a ball-race 13and an inner part 14, of reduced In the bottom of the recess 14 is aslight depression.

Each of the roller-teeth comprises a head or tooth proper 15, and aninwardly extending shank 11 integral therewith. The head isfrusto-conical in form and provides an outstanding shoulder 16 whichserves to hold in place the roller-cage, hereinafter described. Thetooth itself is held against outward movement by means ofretaining-balls 12 which lie partly within an annular groove 17 cut inthe shank 11 in register with. the ballrace 13. These balls are held inplace by the shoulder formed by the inner face of the tooth-ringsurrounding the shank 11, and are held against inward movement by theinner face 18 of the ball-race 13. The inner end of the shank 11 isprovided with a slight central concavity, between which and that of therecess 14 a thrust-ball 19 is placed. All inward pressure upon the toothwill be received by this pivotal thrust-ball, and thereby diverted fromthe rollers and retainingballs 12.

The tooth-shank is journaled on a series of antifriction rollers 20,which are held in proper alinement and spacing by a cage consisting oftwo rings 21, rigidly connected by rods 22. Preferably the ends of therollers 20 are pointed, as shown at 20, and the recesses 23 in the rings21 to receive these pointed ends are correspondingly shaped. The rings21 are dished, as shown, in order to present a perpendicular face to theend of each of the rollers 20. The cage and rollers are rotatable andare held against outward movement by the projecting shoulder 16 of thetooth.

The wheel is assembled by placing its member 3 in an inverted positionfrom that shown in Fig. 2, with the tooth-ring 5 in po sition thereon,inserting the sets of rollers 20 into the tooth-sockets, then insertingthe teeth and the thrust-balls 19, then dropping in the retaining-balls12, then slipping the ring 4 over the hub 6 into contact with member 3and ring 5, and lastly placing the fastening-screws 8 and 9, whereby thewheel is solidly united and the tooth-ring is prevented from turningrelatively of the members 3, 4.

What I claim as my invention and desire to secure by Letters Patent, is:i

1. A gear comprising a body having a series of tooth-sockets therein,teeth journaled in said sockets and each comprising an inwardlyconverging tapered shank seated in the socket and an integral headextending out of such socket, an anti-friction bearing for said shanknear its head, and an end-bearing axially located at the inner end ofsaid shank for resisting an inward thrust thereon.

2. A gear comprising an' annular rim having therein a series of radiallydisposed tooth-sockets, rotatable teeth seated in said sockets, each ofsaid teeth comprising an inwardly converging tapered shank and a headextending outward of the periphery of the body, and a series of taperedrollers interposed between each of said shanks and the surrounding wallsof its respective socket.

3. A gear comprising an annular rim having therein a series of radiallydisposed tooth-sockets, rotatable teeth seated in said sockets, each ofsaid teeth comprising an inwardly converging tapered shank and a headextending outward of the periphery of the body, a series of taperedrollers interposed between each of said shanks and the surrounding wallsof its respective socket, said body having a bearing surface opposed tothe inner end of each of said shanks, and a rotatable bearing interposedbetween each of such bearing surfaces and its respective shank.

4. A gear comprising a body having a toothsocket therein, atoothcomprising a shank seated in said socket and a head extending outwardlytherefrom, an anti-friction roller bearing adapted to resist lateralpressure on said shank, said body having a bearingsurface opposed to theinner end of said shank, and a rotatable bearing axially interposedbetween said bearing surface and the adjacent end of said shank.

5. A gear comprising a body having in its periphery a tooth-socketclosed at its inner end, a tooth comprising a shank seated in saidsocket and a head extending outward of the periphery of said body, aseries of rollers surrounding said shank and fitting between said shankand the walls of said socket, and an axially located thrust-ballinterposed between the inner end of said shank and the body of thetooth-socket.

6. A gear comprising a body having a tooth-socket in its periphery, atooth comprising an inwardly converging tapered shank seated in saidbody and a head extending outwardly therefrom, and an axially positionedthrust-ball engaging the inner end of said shank.

7. A gear comprising a body having a tooth-socket in its periphery, atooth comprising an inwardly converging tapered shank seated in saidbodyand a head extending outwardly therefrom, said shank being concaveat its inner end, said body having thereon a concave bearing surfaceaxially opposed to said inner end of the shank, and an axially locatedthrust-ball interposed between said shank and concave bearing.

8. A roller-tooth gear having in its periphery a tooth-socket providednear the inner end thereof With an enlargement forming a shoulder aroller-tooth shank mounted in said socket and having an annular groovein register with said enlargement of the tooth socket a series ofretaining-balls within said groove and having contact with saidshoulder; a series of rollers disposed around the tooth-shank withinsaid socket, and an en'd bearing for said shank.

9. A gear comprising an annular rim having therein a series of radiallydisposed tooth sockets, axially rotatable teeth seated in said sockets,each of said teeth comprising an inwardly converging tapered shank andahead extending outward of the periphery of the body, a series oftapered rollers interposed between each of said shanks and thesurrounding walls of its respective socket, said rollers having conicalends, retaining rings having seats for said conical ends and rigidlyconnected to keep said rollers spaced apart.

10. A roller-tooth gear comprising two members secured together face toface, a tooth-ring seated upon said members and held against relativerotation, said tooth-ring having a tooth-socket therein, said socketextending radially through said ring and being enlarged to form aball-race at the inner face of said tooth-ring, a roller-tooth shankmounted in said socket and having an annular groove in register withsaid balLrace, and. a series of retaining-balls within said groove andball-race.

11. A roller-tooth gear comprising two members secured together face toface, a tooth-ring seated upon said members and held against relativerotation, said tooth-ring having a tooth-socket therein, said socketextending radially through said ring and being enlarged to form aball-race at the inner face of said tooth-ring, a roller-tooth shankmounted in said socket and having an annular groove in register withsaid ball-race, a series of retaining-balls within said groove andball-race, a series of rollers disposed around said shank within saidsocket, and a retaining-cage for said rollers.

12. A roller-tooth gear comprising two members secured together face toface, a tooth-ring seated upon said members and held against relativerotation, said toothring having a tooth-socket therein, said socketextending radially through said ring and being enlarged to form aball-race at the inner face of said tooth-ring, a roller-tooth shankmounted in said socket and having an annular groove in register withsaid ball-race, a series of retaining-balls within said groove andball-race, and an axially located thrustball rotatably supported at theinner end of said tooth-shank.

13. In a roller-tooth gear, the combination of a body having therein atooth-socket, a roller-tooth shank mounted therein, a series ofconical-ended rollers around said shank within said socket, and aretaining cage having end bearings for said rollers.

14. In a roller-tooth gear, the combination of a body having therein atooth-socket, a roller-tooth shank mounted therein, a series ofconical-ended rollers around said shank within said socket, and aretaining cage comprising a pair of connected rings provided withconical bearing-sockets for the ends of said rollers.

15. In a roller-tooth gear, the combination of a body having therein atooth-socket closed at the bottom, a roller-tooth having an inwardlyextending shank mounted in said socket, rollers disposed within saidsocket around the toothshank, and a pivotal thrust-ball between theinner end of said shank and the bottom of said socket.

16. A roller-tooth wheel comprising two members each having an outerflange and secured together, a tooth-ring seated upon said membersbetween said flanges and having therein a tooth-socket, said membershaving therein a recess forming the inner end part of the tooth-socket,said recess being enlarged adjacent to the inner face of the tooth-ringto provide a ball-race; a roller-tooth shank mounted in said socket,said shank having therein a ball-groove in register with said ball-race;a series of retaining-balls within said groove and ball-race and havingcontact with the inner face of the tooth-ring; and a series of rollersdisposed around the toothshank within said socket.

17. A roller-tooth wheel comprising two members secured together, atooth-ring seated upon said members and held against rotation thereon,said tooth-ring having therein an inwardlytapering tooth-socket which issubstantially reduced at its inner end so as to provide a shoulder for aset of retaining-balls said lateral members being provided with a recessforming a continuation of the toothsocket and comprising a ball-race,the outer face of which is formed by the inner face of the tooth-ring; aroller tooth having a shank disposed Within said socket, said shank having a ball-groove therein in register with said ball-race,retaining-balls within said groove and race, a pivotal thrust-ballbetween the inner end of the shank and the bottom of its socket, and aplurality of rollers around the tooth-shank Within the larger part ofthe tooth-socket.

18. In a roller-tooth gear, the combination of a body having therein atooth-socket, a roller-tooth shank mounted therein, a series of rollersaround said shank Within said socket, a retaining cage having endbearings for said rollers, means loosely securing said shank within itsrecess, and said shank having a shoulder adapted to retain saidretaining cage in the socket.

Signed at Chicago this 8th day of April 1907.

CARL AUGUST J ANSON.

Witnesses ANDREW LARsoN, E. A. RUMMLER.

